That 4000K is really, really nice, and while I don't have a way to measure it, it seems more 4500K than 4000K. It's a lot less yellow than other emitters, and even though I actually prefer that yellowish, the 219B is shockingly neutral.
The version differences usually impact the output and draw; every batch is a little different. I think the last set, the LLLL ones were really, really low. Some people prefer that, others do not.
And yeah, it sounds like there are no plans to restock those on Illumn. I remember him saying, the minimum purchase is now 25 of a custom item, so I think he's worried about sitting on a lot of stock that no one buys. I half wish he'd try a survey or poll through his subscribed e-mails (or even here), because there have been several of us wanting him to restock. Before he ran out of stock, he was essentially the only way to get L, LL, LLL, or LLLL neutral M31's, and LLL and LLLL M61's. I think if he only had to stock maybe LLL and LLLL models of both, maybe it'd be more likely. And, from how the last batch went, that's how they sold out...because, again, that's the only source of the LLL and LLLL dropins these days.
Honestly, even though it's "stepping on his toes," I think it's probably worth reaching out to Kosen, and letting him know you're interested in some LLL, LLLL, and/or M31 modules. Last I contacted him, he said he sees a bit of interested in M31's and LLL/LLLL drop-ins, but it sounds like he was on the fence (I wonder if he was trying NOT to step on Illumn's toes). It seems like Kosen is moving towards building out an online storefront, so maybe him being the place to get LLL and LLLL modules could be a nice lineup to have. He'd probably be game for doing the 519A, too. I like both the 219B and 519A enough that I'd get a few of whatever is released.
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